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- W3204337020 endingPage "132618" @default.
- W3204337020 startingPage "132618" @default.
- W3204337020 abstract "The recovery of platinum group metals (PGMS) from high-level radioactive liquid waste (HLLW) not only has a complementary role in alleviating the shortage of rare precious metals but also is helpful for the final disposal of radioactive waste. In this work, a new cationic covalent triazine framework (CTF) named as cationic pyridyl triazine polymeric network (CPTPN) is designed and synthesized by ZnCl2-catalyzed ionothermal method for recovering of Pd(II) from HLLW. The excremental results shows that palladium can be efficiently adsorbed by CPTPN from 3 M HNO3 solution via anion exchange with fast adsorption kinetics with adsorption equilibrium reached in 10 min. The adsorption isotherm for Pd(II) follows the Langmuir model, which reveals the maximum adsorption capacity (qm) of 339.8 mg g−1 and 389.7 mg g−1 at 3 M HNO3 for CPTPN-Cl and CPTPN-NO3 , respectively. Further studies show that the qm of CPTPN-NO3 in 6 M HNO3 can reach a higher level at 428.6 mg g−1, which is the highest record for Pd(II) recovery in 6 M HNO3. In addition to high thermal stability, CPTPN exhibits a good irradiation stability with excellent adsorption performance maintained after 1000 kGy of γ-irradiation. Furthermore, CPTPN has an excellent adsorption selectivity for Pd(II) in simulated HLLW. Although the selectivity of CPTPN-Cl for Pd(II) is found to be unsatisfactory due to the significant co-adsorption of Ag(I), this problem can be well solved by changing Cl− ions in CPTPN-Cl to NO3−. Both CPTPN-Cl and CPTPN-NO3 show excellent reusability in 5 adsorption–desorption cycles. Thus, CPTPN can be considered as a candidate adsorbent that can tolerate high irradiation and high acidity for selective recovery of Pd(II) from HLLW." @default.
- W3204337020 created "2021-10-11" @default.
- W3204337020 creator A5003295506 @default.
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- W3204337020 creator A5070644172 @default.
- W3204337020 creator A5081868081 @default.
- W3204337020 creator A5088065108 @default.
- W3204337020 date "2022-02-01" @default.
- W3204337020 modified "2023-10-16" @default.
- W3204337020 title "High acidity- and radiation-resistant triazine-based POPs for recovery of Pd(II) from nuclear fission products" @default.
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- W3204337020 doi "https://doi.org/10.1016/j.cej.2021.132618" @default.
- W3204337020 hasPublicationYear "2022" @default.
- W3204337020 type Work @default.